Calendar invitation from exchange or google calendar

hello, when i receive an invitation calendar from exchange i can’t read the email in client “mail” (the email il blank) and it is not appointed on my calendar. when i recieve an invitation calendar from google calendar i see the invitation, i accept that but it is not appointed in my calendar. i’m testing nextcloud ver 21.
someone have the same issue? there is a fix?

sorry, this is really an old issue - see