"Credentials" doesn't relate to your P45 data, it relates to the data that you're using to login to the gateway.

4 things need to be correct:

• HMRC gateway login (usually 12 digits, sometimes 12 digits mixed with letters)
• HMRC gateway password (case sensitive, a maximum of 12 characters)
• Tax office (a 3 digit number)
• Tax reference (a mixture of letters and numbers, usually between about 3-8 characters)

If any of those are wrong you'll fail to submit with a "credentials" error. We've been told many, many times that people are entering correct credentials into our software but HMRC are rejecting them. That has never once been correct; the credentials invariably turn out to be wrong when we examine them (sometimes people have got quite huffy about this issue!)

The pinned thread relates to an incident last year where HMRC was accepting P35/P14 submissions for a few hours without acknowledging their success. Then everyone got their success notices all at once later on. We'll unpin it (if we can work out how to) because it is no longer relevant.

In the payroll reports folder (Reports/Reportfolder) there is a file called "inyearmovements yymmdd hhmmss.xml" (ie with the date and time it was created. If you email that to us we'll check why it is being rejected.

Thanks for your patience, Jane