I had a Chia farm with 300+ plots and 12 harvested Chia coins. My pc died, so I reinstall Chia on a new PC (after several months… ) and connect my two external drives with the plots.
It took over about one week to sync and after syncing there are no coins in my walled and I only have 4 plots. 303 plots with missing keys.
The 24 words that you use to sign in are associated with a specific wallet.
If your new PC used 24 words that are different from your old PC (different from when you won 12 Chia), then you will not see those 12 Chia. You must use the same 24 words.
Same for your new PC complaining about missing keys to your plots.
Your 24 words are your keys to farm your plots.
I am not running Chia 2.1.1, so I cannot be 100% sure of the following.
On my GUI, there is a “Log Out” symbol. You probably have the same thing.
I have never used that “Log Out” option. But it will probably take you to a login screen, where you can enter the 24 words that you created on your old machine.
I hope / believe that your issues will be resolved upon signing in with your 24 words from your old machine.
If you used your old, original 24 words to sign in, then you should have access to your 303 plots.
If you do not have access to your old plots, then those old plots were created with some other keys (other 24 words).