Hello, For the past few days, I have received a “500, Internal Server Error“ message (that I have listed in my Subject Heading).  I have attached four sequential error message details for you.   I hope that you can help me. Sincerely,  

Bruce Glazer 

I'm trying to synchronise my Nextcloud contacts and calendar with my Android phone. I use DAVx5 and it works very well with the contacts app and the calendar app. However, I can't integrate it anywhere in OneCalendar because access via DAVx5 is apparently not possible. It can't be that you can't access device accounts. Is this a programme error? Oh yes, you can specify Nextcloud under Accounts, but this did not work with all variants and settings. Too bad, these problems/errors will probably force me to look for an alternative.

Translated with DeepL.com (free version)

This calendar has deleted past events. I don’t know how to get them back as I have redownloaded all of the same calendars 

The description pretty much says it all. I have several calendars successfully syncing to One Calendar for Android from different sources, two of them are from Office 365. All the appointments sync correctly except any recurring appointments don't sync to One Calendar. 

It's not possible to change recurring appointments

Ik woon in België, maar ik kan de Nederlandse feestdagen niet veranderen in de Belgische feestdagen. Hoe los ik dat op? ...

Hi there, since a few weeks I can't sync anymore with my exchange server at Ionos hosting. I tried to remove the account in the OneCalendar app and even deleted and reinstalled the app.

Now I get the following error message when I try to connect to the exchange server:

"Error while adding your Exchange account: net_http_ssl_connection-failed".

I also tried to use OneCalendar without validation of the certificate with the same result.

I bought several premium versions of OneCalendar for my family to sync on all devices. Would be great if this works again ASAP.

it shows sync error numerous times

This is the issue I keep getting on my computer and phone. It is driving me nuts and I have tried everything. I am about to get rid of onecalendar. 

Too many requests from Identifier:6eedc5c9-d182-4f3d-b52b-cb910a2fe331 under category:throttle.aad.ags.subscriptionservice.app.list. Please try again later. (TooManyRequests)

Action: Subscribe Calendar: Calendar

XCalendarApp.ProviderBase.Exceptions.AccountRequestException: Too many requests from Identifier:6eedc5c9-d182-4f3d-b52b-cb910a2fe331 under category:throttle.aad.ags.subscriptionservice.app.list. Please try again later. (TooManyRequests) ---> CodeSpark.Apps.Common.Net.Exceptions.HttpException: Response status code does not indicate success: 429 (). ---> System.Net.Http.HttpRequestException: Response status code does not indicate success: 429 (). at System.Net.Http.HttpResponseMessage.EnsureSuccessStatusCode () [0x00040] in <598c91aa0c6d486f89eb9f421dbc278d>:0 at CodeSpark.Apps.Common.Net.HttpClients.OneHttpClient.ExecuteRequest (System.Threading.CancellationToken cancellationToken, System.String url, System.String httpMethod, System.String requestContent, System.String authorizationHeader, System.Collections.Generic.Dictionary`2[TKey,TValue]

Hello OneCalendar Team,

we currently have an issue when synchronizing our calendar with M365. We get a too many requests error 429 from one calendar. We can just dismiss this error and the calendar keeps working fine, but it is showing again and again. We tried to fix this issue by removing all calendar entries from the past year so there are not too many synchronized. This unfortunately did not help. Is there any solution to this issue?

Hi I use OneCalendar to see multiple calendars at once in yearly view. However I noticed that events after 2 years are not syncing from my mobile to my tablet or my Windows app. Is this something that can be fixed please? For example I added an event on my android phone for October 2026 but this is not syncing onto my laptop or tablet. I've tried updating all the apps but this does not make a difference. I purchased the premium version too hoping that would fix the problem but it did not unfortunately. I appreciate your help. Thank

Dear support team,

I have your calendar installed on my Android smartphone and on my Windows laptop. It worked really well so far, but since this week I am getting an error (see attached screenshot) that the calendar is unable to synchronize my appointments. I don't know what to do and how to get this working again, because the error message isn't informative. Do you have an idea, what the problem could be?

Thanks in advance! Stefan Hackel

Hi, I've had One Calendar Premium for years and it has worked just fine.

I have just bought a new computer (Microsoft) and uploaded the app One Calendar. The problem is the calendar is empty. I tried to enter one of my emails (jjhakan@gmail.com or joellejohansson69@gmail.com) but the app doesn't recognise either. As I've had One Calendar for years, I'm not sure which email address I used. Can you find it for me?

The app still works on my Android phone.

My name is Joëlle Johansson. Tel nr +33669470130.

Thanks in advance. Best regards,

Joëlle

Why does Yahoo one time passwords no longer work? :'(

I have several calendars on my iCloud account. After adding an event and selecting a calendar, I cannot change it later in the event edition. Can anyone help?

would like to have tasks to sync with Toodledo tasks

When I have an event (Google) on one day with a start and end time, and I move it per drag and drop in the week view to another day, it does become a all day event, I need to set start and end time again.