We recently started seeing this issue. We have a multiple maps in our PRTG. There is a group that has full access. But one particular map, when I tried to access, I get "Error (bad Request). Sorry, your user account is not allowed to access this information". Even though it has full access. Other maps, same setting, I can access without any issue. Only one map I get this error. I compared the setting with other maps, there is no difference.
User who have full access can't view the map