Samsung
Add an Account to Calendar auf Samsung
Samsung Calendar pulls appointments, tasks and birthdays from two sources: local storage on your phone and any accounts you have linked, such as Samsung, Google or Exchange.
If an account is not added, none of its events, invites or shared calendars will show up, even though the same account might already be active for mail or contacts.
Add an account
Open Calendar, then tap the Menu icon, followed by Settings. Tap Add account, choose the account type you want to connect, and follow the instructions on screen to sign in.
After signing in, Samsung Calendar syncs existing events from that account automatically. This can take a moment on accounts with many entries or shared calendars.
When to use this instead of app-level sync settings
If the account is already added but specific calendars are still missing, check the calendar sync toggles inside the account settings rather than removing and re-adding the whole account.
Removing an account from Calendar only affects what the calendar app displays. It does not delete the account from your phone or from other apps like Mail or Contacts.