step 1 navigate to saucelab then click try it free

step 2 for email don't use temp mail ( no need of verification )

step 3 IMP in top right change " data center " to " US west 1"

now it will look like this 

step 4 now click on live , a dropdown menu will appear , click on cross browser

step 5 now select browser ( i am using chrome 89 and resolution 1400x 1024 and os windows 10) according to you choice

step 6 click start session , wait 10-15 seconds and rdp will start

enjoy! thats it now you have a 28 days RDP you can create it unlimited times