I was migrated from Yahoo Mail to BT Mail last September.
I have 3 email addresses that have been migrated.
2 of them, the Calendar is working fine.
The 3rd one [my main email address], I cannot create calendars or subscribe to the other email address calendars.
When I try to create(add) a Calendar, I get the following message - An error occurred when adding the calendar.
When I try to reload the page, I get the following message - An unknown error occurred. Please try again later
Can anyone help please.
I'm accessing the mail via webmail [google chrome on a windows 10 PC]