Birthdays don't synchronise

On my phone I have a continuous error message about synchronizing birthdays.
The message is: HTTP server error - HTTP 404

How do I solve this?

Regain your privacy! Adopt /e/ the unGoogled mobile OS and online servicesphone

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Try to refresh DAVx⁔ if you use it.

I have no idea if I have it and how to set it up

Could you attach some screenshots of the error?

It’s in Dutch.
Verjaardagen = Birthdays
Opnieuw = again / refresh

Try to delete your account from Account Manager (Settings, Accounts, “your account”, remove), and reconfigure it.

And check if Account Manager app (in the system apps) has all permissions (calendar - contacts - location - tasks)

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Thank you!

Sometimes it’s easy and simple: it works!

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I have an issue on birthday sync but very different from the previous one.
Calendar shows only the birthdays of the contacts of my e.account contact list.
Unfortunately I’m using another carddav account for contacts syncing.
Why Calendar is not able to display birthdays of local contacts list as many similar apps do?
Or in another waywhy Calendar is limited to e.account contacts?