I had that problem. I can sign into Rendo with my email address or my username, but the Purchases tab only takes my username. Are you using your email address on the Purchases tab?

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W11,Intel i9-14900KF @ 3.20GHz, 64.0 GB RAM, 64-bit, GeForce GTX 4070 Ti SUPER, 16GB. 

Old lady hobbyist.

All visual art or fiction is "playing with dolls."