Yes, follow @JoshQ instructions and make sure both parties have it on. My husband and I would have this issue because his phone kept signing him out of the "read receipt" settings for unknown reasons but now it works.
S10e user here.. Good. I thought it was just me screwing up my settings. I've tried everything I can think of to correct it, but hasn't helped. I need to correct this asap 😫
Absolutely having the same issue with my S20 after the update. I power cycled my phone, checked my message settings, and verified that the recipients had their read receipts still enabled.