I see this “introduction” to gs290 dated October 2020 Help us test the /e/ OS on the GS290. You are probably aware that Gigaset dropped support for the device some time ago. Service-Portal | Gigaset
Users of the current Android 12 (S) are likely to face drop of support of Android SPL during February or March.
Maybe I missed it but I don’t see GS-290 mentioned in either
[LIST] Devices which will be getting upgraded to /e/OS T - Part I
[LIST] Devices which will be getting upgraded to /e/OS T - Part II