Remove the existing method first, then add the new one; or split WeChat Pay and Alipay across apps.
Didi often allows one primary method.
If adding a backup fails, Didi limits one active method at a time:
Didi often lets you keep one primary method; to add a second you may need to remove the first, or use a different app for the other wallet.
Every case shows the diagnosis and the first step - free. The full step-by-step fix for this exact case, the decision tree, and the offline kit are $9.99.
When the app blocks a second method, the kit shows the swap path and the two-app split.
The exact taps to swap or keep two wallets.
When one method is forced vs when two are allowed.
The setup steps as a printable card.
If you must pay right now:
Most travellers know about three of these before they fly. This one is often not one of them.