Do you know what the error code he gets when he tries to connect his TSB account?
He would have got told to update or reconnect to the new open banking that has come out and all makes have to move over to, there is an available feed for TSB so when your client on the banking page, goes to add account, search TSB and then he can either connect to the business or personal account depending what one he needs, and connects to it.
If they still have issues get them to clear their cache and cookies and then try connecting the account again.
Let us know how you get on.
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