Have you tried reaching out to the Creator Support team? They may be able to help you with this: https://goo.gl/BxLi8H . Hope this gets resolved.
@TeamYouTube mobile users can’t sponsor unless I have a link, I tried the /member after my channel link but it’s not working: could you send me my member link?
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I just sent the email thanks
End of conversation
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MissingMind
Sophiaverybest