It happened several times for me and my friends. First in Brightwood we were unable to enter Sharvey’s Lumbermill - restricted area. There were several players in that area having the same issue.
Later we went’s to Weaver’s Fen to finish Trial of the Chronicler for Syndicate and we got exactly the same info: 'restricted area". And again, no one could enter Swampwater Fishery - several players tried and couldn’t.
It appears to have cleared, as I was able to access Swampwater Fishery. Did not restart the game. Only thing I did was go way to the south and complete quests there and then when doing other quests in the north found the “restriction” gone.