Samsung S9 - Accounts no longer syncing

[Mr_G]

Hi. For the past 4-5 days, none of my accounts on my Samsung S9 appear to be syncing. Not sure what could have caused this? Have tried the usual, rebooted phone a few times, cancelled and reattempt sync for each account from settings menu, nothing works. anyone else having this issue? Thanks. 

[kingtom]

Remove accounts and re-add them

[wra01]

Also,

Check your Master Sync is enabled. Pull the Notifications Bar down and swipe across and check if Sync is enabled.

I would check Email Sync Schedule and Email Sync Period for each Mailbox Account.