I’ve linked the Company File User ID to my my.MYOB Account and I’m getting a 401 error when uploading/downloading from MYOB

If you have linked your Company File User ID to your my.MYOB login via either of these 2 dialog boxes:

then the way you authenticate with the AccountRight API is slightly different to using a standard non-linked Company File User ID. You need to check this checkbox in the MYOB Company screen if you are using v1.0.8 or later of the fmAccounting Link file:

This will automatically handle the changes required when using a linked my.MYOB account.

If you are using an earlier version of fmAccounting Link  you can simply disable the highlighted step below in the Set HTTP Headers script: