AFCI & GFCI nuisance tripping
Get a wiring tester and verify the GFCI outlet is wired correctly.
Swap out he 20A AFCI breaker for a standard 15A or 20A breaker and then see if the GFCI outlet works after that.
Use a multimeter at the GFCI outlet to see if the voltage is in the expected range.
Post photos of wiring at all locations so we can better help you.