Dear community,
We have been using DMF to import customer accounts. After the initial data import we noticed that some customer accounts were missing the Default Financial Demsion under the Customer account view.

This was because the "Copy values to this dimension on each new Customer created" setting was set to No

I change this setting to Yes and newly imported Customer accounts now have the Default Financial Dimension populated correctly.

However, the initially imported Customer accounts still don't have these dimensions and our business processes require this information to be published when posting on customer accounts.
As there were a couple of thousand Customer accounts created without the Default Financial Dimension I was looking for a more automated wat of how to do a mass update for such Customer accounts.
I was trying to add the Default Financial Dimension trough the Add-In Excel (CustCustomerV3Entity). I was able to select the specific column, but when updating the "Default dimension display value.Customer" attribute I get the following error :: 'A row update in data set CustomersV3 was not published. Error message: 'The dimension display value could not be generated. Internal error: Error found when validating record.'

I have the SysAdmin role in D365.
Do you know if it is possible to update the Default Financial Dimensions for the Customer account via the Excel Add-In? Perhaps I am missing something, so looking for some guidance.