How to identify, and ideally solve, transaction rejected

I have a live mint right now, and someone tried to mint, and the transaction failed. Would be great to find out why so I can ask him to try again and recreate steps.

The contract: Manifold Studio

0x26E1d76E6f0307812430AEe216201004D8ae73B6 this is the wallet that failed


That usually indicate the user didn’t complete the signature on his mobile wallet. Is this issue only happened to one user or are you seeing reports from others as well?