Uploading iOS app for a customer who isn't an organisation

I developed an iOS app for a customer and would like to upload it to his store page. I was given admin permissions , however I failed to upload the iOS build to his AppStore page. My account isn't being recognized as part of his developer team.

After some googling, it appears that in order to upload an iOS build for someone else, that someone must enroll as an organisation to give me the proper certificates.

My customer tried to enroll as an organisation, however he was rejected by Apple due to "Your legal structure is a Proprietorship. Apple states “If you are a Sole Proprietorship/Single Person Company, enroll as an individual.”

Is there a way for me to upload the app to his Appstore page?

This was not helpful at all.

I was already made Admin on his page, but still I'm not able to be part of his team.

Only organisations can invite other users to be on a team, however my customer doesn't qualify to apply as an organisation

Uploading iOS app for a customer who isn't an organisation
 
 
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