MTD VAT return error

Hi - hoping someone can help. My first VAT return - last period - with Datatdear add-in submitted to HMRC just fine.
But this time, I got an error back:
[Z/JLLSEoAU+r0hS/unPuZQ== - HMRC Ref.: Charge Reference: ] : Error - amount should be a monetary value (to 2 decimal places), between 0 and 99,999,999,999.99 (INVALID_MONETARY_AMOUNT)

Any suggestions? - all the 9 VAT boxes have monetary amounts in them on the datadear worksheet
And if I need to contact HMRC - whats the best way to do it?

Phil

I’d suggest checking the 9 values to ensure they are definitely to two decimal places and not just displaying two decimal places.

Thanks - I tried reformatting the values to numeric 2 dec places - still didnt work
Then I started a clean new MTD worksheet - first time this failed, but different error - tried again & it submitted successfully - all very odd

Phil