Calander dont synk to Murena Phone 5

Of my five calendars on Murena on my Windows computer, only one syncs to my Murena Firephone 5 phone. What to do?

Try: Settings > Accounts > your ID Murena account > My Account > Settings > tap your ID Murena account > Select CALDAV > two icons bottom right are Refresh calendar list and Synchronise now. (Long press the icons will identify themselves.)

Depending on your calendar subscriptions, maybe Select WEBCAL. Note also options in top right 3 dot menu.