Also, under Admin > Customization > Config > Authentication make sure that your Forem instance is NOT in invite-only mode:
We do use the value of this setting in a few places to determine if a Forem instance is considered private or not. I know it's confusing to have two similar options and I already started a discussion about standardizing around one.
For the feed the setting @ellativity
suggested works but to avoid other suprises you should make sure that these two settings agree for the time being.
For further actions, you may consider blocking this person and/or reporting abuse
Also, under Admin > Customization > Config > Authentication make sure that your Forem instance is NOT in invite-only mode:
We do use the value of this setting in a few places to determine if a Forem instance is considered private or not. I know it's confusing to have two similar options and I already started a discussion about standardizing around one.
For the feed the setting @ellativity suggested works but to avoid other suprises you should make sure that these two settings agree for the time being.