Hi [Contact Pref Name],

I hope you are well.

Just a quick reminder about the HMRC authorisation process. You should have recently received a letter in the post from HMRC containing a code. This code allows us to officially act on your behalf with HMRC, making managing your tax affairs much easier.

If you could share the authorisation code with us as soon as you get a moment, that would be fantastic. It's a small step but a very important one to make sure we can handle everything smoothly for you.

If you have any questions about this or if you can't find the letter, just let me know and I'll be happy to help.

Thanks,
[Current User]