Clemence Bodart

Hi there, I am preparing my tax return with the UTR number assigned to me when I arrived in the UK in 2019. But when I look at the previous tax returns made by a tax agent on my behalf, I realise they had used a different UTR number that I cannot access online. So basically, I have one UTR that I can use now but shows no history, and another one with my tax history that I cannot use. The two UTR numbers relate to the same person, name, and NIN. I am afraid HMRC will say I failed to complete my tax return on the UTR number previously used on my behalf... Do you have any suggestions/tips? Thank you