Lightroom Classic to DXO Pure Raw 2

Dear DXO Team & Fellow Photographers.
By way of introduction I am Lyall. If I may I have a question please.

I purchased the new DXO Pure Raw 2 Software yesterday. Its great and am really enjoying the results. There are few workflows and am getting to grips but all in all we are good here.

However, I have a glitch that maybe you can assist with please.

I work in Lightroom Classic, One of the key things for me thats was appealing was that based on an online Video from Thomas Fitzgerald I could take a RAW file ( In this case Raw Fujifilm X-Trans) that had been completely edited from Lightroom Classic to DXO Pure Raw 2, Process it through DeepPrime and then it would appear back in LR as a DNG with all the previous edits intact.

Based on a recommendation I have switched on my Automatically Write Changes into XMP .

The export work on one set of Images but it won’t work on others.
Any Ideas why this may be happening, is anyone having the same challenge.

Thanks for your time.

Sincerely Lyall