Can't transfer this app because of "Internal failure"

We are trying to transfer an iOS app to another account. Currently when we click "transfer app", we get:

You can't transfer this app because of the following reasons:
Internal failure
Something went wrong with your request. Try again later.

Before WWDC20, it was:

Apps built using Mac Catalyst cannot be transferred at this time.

We were preparing Catalyst version of our app, but didn't submit it for review yet. Will we be able to transfer our app if we ship Catalyst version?

Any help will be appreciated.

We have encountered this problem in the same way now, and hope to solve this problem as soon as possible.
Can't transfer this app because of "Internal failure"
 
 
Q