thanks a bunch @MichaelG & @KaityEagle, member support reached out and there was apparently an error with my account. All good now and I'm able to submit the endorsement.
Glad they fixed it for you 🙂
Now you get to play hurry up and wait 🙂 I was finally approved this afternoon.
Congratulations! How long did you wait for the endorsement to be approved? I'm guessing 6-8 weeks?