USB Not Supported S21 Plus

[SirSlothXCI]

I've recently upgraded from an S9 to the S21 Plus. Since there is no longer any headphone jack, I bought an Aux to USB-C adapter in order to play music through my car audio system however I am getting the following error message when plugging in the adapter.

"The connected USB device is not supported."

This error pops up immediately after plugging it into the phone's USB-C port without being connected to the car yet. It does not appear when using the adapter with my S9.

Any ideas on what the problem could be? 

[automatic911]

allow USB debugging

[Batdude]

This didn't work for me

[Lokiron]

I did and nothing changed. Still getting "device not supported".

[Kaybe]

I had the same problem when I upgraded from an S8 to the S20+. Instead of buying that dongle, I got an aux-in bluetooth receiver.

[seumo]

did you get that Aux USB C from samsung? if not your phone won't recognize others

[Batdude]

Sounds like something Apple would do. Hope this isn't the way Samsung are going as this is the main reason I don't use Apple products

[henry-js]

I've tried it with a Samsung usb-c dongle and it still didn't work

[SirSlothXCI]

Thank you for the responses. I bought a 3rd party dongle. If I buy the official Samsung adapter, will this resolve my issue?

[MazharNizamani]

Having same problem with my S21 Ultra 😞