I use LR a lot but haven't done in a few months. Just jumped back in and saw that masking and healing are now premium features. This used to be part of the monthly LR payment and now we're paying more to access these features? Why are you charging more?
Using your ID from this forum I see you have a monthly subscription to Photoshop with 100GB storage. It sounds like you may have used Lightroom on a trial basis and were able to access the Mask and Healing brushes but that is no longer the case.
You could subscribe to the Photography plan with 1TB for $1 less than you pay now and have access to Photoshop and the entire Lightroom Ecosystem. (Classic, desktop, mobile, web)