Question Help with router

[nakex]

Hi,so I recently bought a new router,I plugged everyting in,but it doesn't seem to work,my phone can detect the router,but when I connect it says that the internet can be unvalabile,I don't have fiber optic btw,also tried from pc but the same

 

[nakex]

• My computer is a gaming one,gtx 1060,ryzen 5 1600x etc.....
• The router that I bought is an Asus wireless -AC750 Dual-Band Gigabit Router
• Idk what my modem is
• .

- my motherboard is an Gygabyte GA-AB350M-GAMING 3
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- Windows 10

• Telekom is my isp
• devices connected are my computer, and 3 phones devices at a time.

 

[nakex]

anyone?