If you see a "Forbidden access" error when trying to add or update a supplier's bank account number in Datamolino, this is caused by a Xero permission change that took effect on 29 June 2026. It is not a connection issue with Datamolino.
What changed
Xero now requires the Bank account admin permission to add or update bank account details on existing contacts. Bank details can still be added when creating a brand new contact in Datamolino, but any attempt to add or change bank details on a contact that already exists in Xero will fail without this permission.
What you'll see
When attempting to add or update bank account details on an existing contact, Datamolino will display:
"Forbidden access (corrupted connection). If the issue persists please reconnect your folder to Xero."
This error message comes directly from Xero but in this case, reconnecting your folder will not fix this. The error is caused by a missing Xero permission.
How to fix it
A Xero user with Manage users permission needs to enable Bank account admin for the affected user:
In Xero, click your organisation name → Settings
Under General, click Users
Click the user's name
Scroll down to Bank account admin
Tick "Can add and edit bank account details held for customers and suppliers" and click Update permissions
Once enabled, the user will be able to add or update bank account details on existing contacts as before.