After some initial challenges, I’m thrilled to share my successful integration of Silvercrest motion detectors and door/window sensors with my Homematic system! 
For those who might have encountered similar issues, here’s what worked for me:
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Resetting the Devices: I found that a hard reset (removing the battery for about 30 seconds) helped the devices establish a fresh connection with the Homematic gateway.
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Using the Homematic App: Instead of relying solely on the Silvercrest app, I used the Homematic app to manually search for and add the devices. This process took a bit of patience but ultimately worked.
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Firmware Update: Ensuring both the Homematic gateway and the Silvercrest devices were on the latest firmware versions made a significant difference in their compatibility.
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Testing in Stages: I tested one device at a time to isolate any issues. Starting with a single motion detector allowed me to troubleshoot effectively before moving on to the others.
Pro Tip: If you’re experiencing connectivity issues, try placing the devices closer to the Homematic gateway initially. Once they’re paired, you can move them to their desired locations.
This setup has greatly enhanced my home security system, and I’m now able to monitor my home with peace of mind. 
If anyone else is struggling with similar issues, feel free to reach out—I’m happy to share more details about my troubleshooting process!