It is a Samsung Galaxy Note 9 with the following configuration:
Email address is a GMX address
Account is a Google account registered with the GMX email address above.
Google synchronisation is all activated, except email synchronisation, because email address is GMX like I mentioned.
If somebody sends me an invitation for calendar by email, normally I should be able to accept or decline it. But it is only possible to copy the invitation to the calendar.
Does anybody know how I can fix this problem?
Thank you in advance