conection issue with YLDD01YL strip

I have an "old " light strip, was using it in my old house with no problem. Last year I moved a bit and couldn’t find them, now I did and wanted to link them with the rooter. However every time I try it fails, I reset the light, add it to mobile, select a 2.4 GHz wireless with password without special characters and everytime it does the first step then from 50 to 99% in a second and stop there to then tell me network error. What can I do? I even added the Mac of the light to the whitelist of the modem but nothing…