yea this has been reported before. are you friends with him?
is this a glitch?

ok, he might have changed the thing to "only friends can message me" so it is not a bug. The "only friends can message me" is in settings

This is club news, so I assume that blocking, muting, and profile settings don't matter.
On the other hand, if you don't want to recieve news notifications, go into the club settings and change the setting.

This is club news, so I assume that blocking, muting, and profile settings don't matter.
...
If the admin that created the News has their settings so that only friends can send messages, that would impact it, since the News comes from that member.

no, you are muted
remember when @ragdol_kitten posted the same bug?
Yes, I remember

so like i was scrolling through my messages then i saw this
but then, it was like muted for me for only to this sender whom i never chatted with
That Appears Only If...
1. IF you and the one you are messaging are not friends. Because sometimes, people set their messages from friends only, give them a friend request, if they accept, try again
2. IF you are blocked, you cant message someone who have blocked you.
3.IF you are muted.
4.IF its yourself
There is a message below, click that, it is https://support.chess.com
so like i was scrolling through my messages then i saw this
but then, it was like muted for me for only to this sender whom i never chatted with