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This could depend on your FGT configuration as FGT also checks whether client is allowed to connect. As you mentioned, rebooting AP not solving the issue also points to this direction. I suggest you open a ticket to Fortinet TAC who would be able to ...

not sure what version of image you are running on your AP. If it's pretty old, please update to a newer version such as 5.6.4 or 6.0.x after. The old version software doesn't work with newer browser including Chrome. If you can't upgrade, you can try...

Please see whether login with a different browser helps. 

You just mentioned in your previous thread that you have a 221E and now it 's 222E? We don't have known issue like the ones you ran into in these versions. Also, working with FLCD but not FGT indicates that it's most likely some configuration issue. ...

What version FOS is running on your FGT? AP version?