https://wireless.wiki.kernel.org/en/users/drivers/iwlwifi
https://wireless.wiki.kernel.org/en/users/download
it took a while for me to resolve the wifi AND bluetooth issue for this particular intel AX210 card, but bottomline:
- updated my linux kernel (debian 11) to 5.14 (bpo version as of the writing of this solution) which solved the wifi issue
- replaced ibt-0040-0041.sfi file inside /lib/firmware/intel folder with the latest version found in the linux firmware git repository then do cold reboot (shutdown and turn on computer again, not reboot only) to make bluetooth work.
Not sure if we can attach files here, but if so, I can drop you that ibt-0040-0041.sfi file (the bluetooth firmware file for that card). To download the file from that page, click the "Plain" link to the right, then drop it into /lib/firmware/intel to overwrite the existing file (you might want to back up the existing file first).