Having an issue I'm hoping someone has some experience with.

I'm managing a team in the MLS for the first time. I signed a new player mid-season (Senior contract, not DP).

The purchase went through without issue, but I am not able to register them with the squad. They're marked as "out" and the option is greyed out to change it.

I have 3 international slots available, so that's not the issue and am under the salary cap limits. The player had a few weeks left on an injury, which I thought might have something to do with it but now they're fine and I still can't register them.

Any ideas?