CK II - Crusades get called when there is no one to call/parrticipate

[Chep]

One line summary of your issue
Crusades get called when there is no one to call/parrticipate

Game Version
3.1.1

What expansions do you have installed?
All of the above

Do you have mods enabled?
No

Please explain your issue is in as much detail as possible.
I own the entire world, including all holdings....and I get the message that a Crusade is targeting one of my vasalls/me.

Steps to reproduce the issue.
Own entire world, wait.

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[Chep]

the most annoying thing about this is that I have to manually accept all the messages of support from my vasalls.

Dear Paradox, why can't we change the message settings for these and other spammy notifications?

(other examples: invitations to feasts, ransom demands met, counties prospering, etc)