Thanks baris, I have upgraded redis to the latest version and now it works!
UNSOLVED Username length
Hi, please take a look at this username; wondering, how was the 16 limit circumvented (now changed to 12): https://community.h7.org/user/humpfree-zombie-killer-and-violet-thrall
(user is legit, not spam)
Long usernames are generated when using SSO at registration (all good).