The one in your original comment does work for me (I'm accessing in a browser) so maybe it's that you didn't include a label for this one?
no-label-here
spoiler test Spoiler text :::
Psst, the spoiler tag didn't work!
The one in your original comment does work for me (I'm accessing in a browser) so maybe it's that you didn't include a label for this one?
no-label-here
spoiler test Spoiler text :::