Some states will mail out the 1099G. Or you might need to go to your state’s unemployment website and use the password, etc. that you have been using to certify for weekly benefits to get your 1099G from the state’s site.
https://ttlc.intuit.com/community/entering-importing/help/how-do-i-report-unemployment-if-i-didn-t-get-a-1099-g/00/26866