Deadline approaching to migrate 3PIP phones to Microsoft Teams through SIP Gateway

A couple of questions:

i) On the https://learn.microsoft.com/en-us/microsoftteams/sip-gateway-plan page, it states that the latest firmware supported for Yealink T46S phones is 66.86.5.1 and the minimum version is 83 (presumably, meaning 66.83.x.x). These versions appear to be specific to the non-Skype for Business (SfB) edition of the T46S (https://support.yealink.com/en/portal/docList?archiveType=document&productCode=95ef8c9dce7c98ba). The latest firmware version for the T46S SfB edition is 66.9.0.89 (https://support.yealink.com/en/portal/docList?archiveType=software&productCode=832014926eb01a2f). Can anyone confirm whether the SfB edition of the phone is supported, or is the suggestion that the non-SfB firmware be deployed on SfB phones?

EDIT: After some testing, this does appear to be the suggestion (i.e., the non-SfB firmware needs to be deployed on the SfB device after the unlocked license is uploaded).

ii) The https://aka.ms/SIP-gateway-enablement-migration-playbook alludes to licensing requirements being "An Office 365 License: A1/A3, E1/E3, F1/F3 or G1/G3 w/ Teams Phone Standard or A5/E5/G5." Does that mean that M365 licenses (e.g., M365 Business Premium) w/ Teams Phone Standard are not supported?
EDIT: In our testing, the Yealink T46S phone worked with a M365 Business Premium and Teams Phone Standard license.