According to VAT Notice 700/22: Making Tax Digital for VAT you can make adjustments to VAT submission. Below the excerpt from the notice
UK MTD Adjustments Making Tax Digital
Where you are allowed or required to adjust the input tax claimed or output tax you owe according to the VAT rules you must record this adjustment in functional compatible software. Only the total for each type of adjustment will be required to be kept in functional compatible software, not details of the calculations underlying them.
If the adjustment requires a calculation, this calculation does not have to be made in functional compatible software. If the calculation is completed outside of functional compatible software then digital links are not required for any information used in the calculation. However using software for all your calculations will reduce the risk of errors in your returns.
The following rule has the force of law:
Where the input tax claimed or output tax due on a supply has been changed as the result of an adjustment you do not need to amend the digital record of the supply.