+1 having the same issue, running Minecraft Bedrock v.1.21.51. Able to post on one realms and not on another. Xbox profile settings is allow on sharing screenshots.
Update Owner of the Realms where I was unable to post, uninvited me and the invited me again, that did the trick for me, I can now post stories. But remember to empty you enderchest and remove all equipment to a standard chest before attempting this.
Reep
+1 having the same issue, running Minecraft Bedrock v.1.21.51. Able to post on one realms and not on another. Xbox profile settings is allow on sharing screenshots.
Update
Owner of the Realms where I was unable to post, uninvited me and the invited me again, that did the trick for me, I can now post stories. But remember to empty you enderchest and remove all equipment to a standard chest before attempting this.