Hello there,
That's because the link itself is the solution 😉
This is called a deep link (https://learn.microsoft.com/en-us/microsoftteams/platform/concepts/build-and-test/deep-links?tabs=teamsjs-v2)
The onSelect property on my button (within PowerApps) implements the deeplink like that:
If(
!IsBlank(Interview_Gallery.Selected.phone_mobile),
Launch(
Concatenate(
"https://teams.microsoft.com/l/call/0/0?users=",
Lower(User().Email),
",4:",
Interview_Gallery.Selected.phone_mobile
)
),
If(
!IsBlank(Interview_Gallery.Selected.phone_private),
Launch(
Concatenate(
"https://teams.microsoft.com/l/call/0/0?users=",
Lower(User().Email),
",4:",
Interview_Gallery.Selected.phone_private
)
)
)
)