Hello,
I see what is the issue that you are facing, I am an experienced Xamarin dev with around 9 + years of experience in mobile app development industry and have faced these issue a lot while submitting the application, this issue is generally occur when you have a compatibility issue in you project also can be because of bad code declaration I can surely help you with this,
Lets have a call on teams or zoom to discuss this
Thanks,
Anish Nair.