What documents are needed to prove remote work for a DTV application in Thailand?

Hi All, wondering if anyone can share any advice.

I'm applying for DTV in Hong Kong via Evisa and they have requested other documents. Particularly Proof indicating that the applicant can work remotely.

I have already asked our HR and their reply is that we can write in to our line mgrs on this and have them approve to it via email.

When I submitted the authorised email from my manager I received the following from thaievisa:

* Letter issued by company indicating that the applicant can work full-time remotely

* Official letter from employer authorized person's signature and chop

Would anyone have experience with alternative documents that can be provided?

Our HR advised that they don't currently issue official company letters for remote working which I am asking about, however however I was lookig for a few options just in case anyone else has been able to sold the problem.

It seems strange as I have been working remotely full time, even the team I work with are not based in Hong Kong.