Solved Phones[0].interface: invalid value when attempting to switch template

[Alphabetic]

Version 20.0 Update 10 (Build 1277 - AI 1.6.10)

Yealink T42U 108.87.0.26 - Router Phone

Hello

I've attempted to switch the phone template to a custom one but get the error:



I only added 1 line to set minimum ringer volume.

Edit:

Im unable to swap to custom template even if I make no changes to the default.

 

[Alphabetic]

No, thats the problem.

if you look at previous screenshots.

When I deleted/added the phone I used the blank template.

Then I switched to the one with ringer appended.

Although this change is shown when I go to switch again, it doesnt show on this main page.