The 3050 was available with 6th and 7th generation CPUs and that is still not new enough for Windows 11 which requires an 8th gen CPU. However if you download the media creation tool here (second choice) it will not do a CPU check and you can install Windows 11 with your CPU. Keep in mind that Dell will not offer support if you should require it, unless you reinstall Windows 10. But with a system out of warranty that is really not an issue.
Is it possible for me to get an approved processor that will be compatible with the motherboard in my Optiplex 3050 and how do I establish a list of possibilities?
My Optiplex 3050 Does Not Meet Win11 Requirements (Processor)