"Servers cannot process your request" error - Sets

@EA_Kent I've been fighting with this all weekend, having my xbox series s display 'Unable to complete' or whatever it says and getting kicked from mut.
SOLUTION
in my case, turned out I didn't have enough player cards in my collection, but I didn't realize until I tried to auction some players and got that error not enough items of this type in binder. So simply bought about 4k worth of under 1k players and was able to complete the set. What a relief to figure out what was occurring and correct it