How to let the user set a Power Mode for my watch-app?

I've got an issue from one of my users that they can't set a power mode on their Fenix 7 for my watch app.

On all other activities the power mode can be set, but for my activity, the Power mode entry in the corresponding menu is just missing.

Does anybody know what the issue might be? Perhaps something in the manifest, minimum API level? I really have no clue and don't have a fenix to test on, so would love to get any insight.

Thanks in advance

Jiri