I have 4 clients that need VAT filing. Once I click "File VAT MTD" I get a pop up stating "Please check the VAT Registration Number and try login again".
So far I have:
I have deleted each of the VAT numbers and re-entered them several times - no change - On some clients, QB's has put spaces between the VAT numbers and I cannot get rid of them!
Disconnected my HMRC account and re-authorised it - no change
Run QB Desktop File Doctor on all files - no errors
What else can I try?
Many thanks