Does’t want to connect to my Assioma power meter

https://forums.garmin.com/sports-fitness/cycling/f/edge-530/234047/how-to-pair-favero-assioma-single-side-power-with-edge-530

Hi, I tried many times, it is still not connecting. My power meter works perfectly fine. I am able to connect it with my trainer.
But when I want to connect it with my Garmin Edge 530, I don't know why my Garmin takes so long and at the end it is not connected. I have reset my Garmin Edge few times, but it seems something wrong, which I don't know what

Most smart trainers are a power meter themselves and would not be able to "pair" with another power meter. But if your pedals are able to connect to something, we should also be able to connect them to the Edge 530.

It sounds like you may be getting to the last step of pairing, where the Edge displays available sensors and asks to confirm. A small wheel icon will spin in the upper right corner until Add Sensors is selected/confirmed.

Yes, the power meter is listed and after clicking the box, the wheel icon started to spinning and after waiting for such a long time, until the Garmin is going to Sleep mode, the power mode was not added. So frustrating waiting but ended up nothing :-(

And I did that few times already, until I gave up.. 
I want to ride my bike outdoor, and I want my Garmin to connect with my power meter.

After the Edge detects the power meter and displays its name, you must first select the sensor (check the box) and then scroll up and select Add Sensors again (as in the screenshot above). It sounds like you are seeing the power meter detected but not selecting the last step Add Sensor
.
If you are not seeing the power meter detected by the Edge and I'd refer you to Favero to troubleshoot the pedals.

You can also contact Garmin Support for your region to get in touch with a cycling specialist: https://www.support.garmin.com