How do I change the bank account rent comes out of?
Use the change bank details option on your tenancy page — it runs the same Stripe setup again and replaces the old mandate.
The rent card has an option to change your bank details once an account is already linked. It takes you back through Stripe's hosted page to authorise a new mandate, and the old one is detached once the new one is saved.
This is exactly what to do if a payment has failed and a retry is scheduled — updating your details before the retry fires usually means the retry succeeds and nothing escalates.
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Not legal advice
These answers describe how Tenarize works and summarise the law in England as the product implements it. They are not legal advice about your situation, and the law changes. For free independent help, Citizens Advice and Shelter both cover renting in England; for anything unusual or contested, take advice from a solicitor.
Tenarize does not currently support Scotland, Wales or Northern Ireland, whose tenancy regimes are different.