Did you check /admin/settings/reputation, maybe the reputation setting is higher than 1 which would prevent new users from uploading profile pictures.
Disable ability to change gravatar
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Hello I'm fairly new to nodeBB and I was wondering if their is a way I can disable the ability for users to change their avatars. I wish to have a proprietary avatar for my forums that people can not change or upload their own.
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Try this, in Admin -> Settings -> User
Users will still be able to upload their own avatars though. There isn't a setting to disable that, but for the time being you can set "Maximum User Image File Size" to 0. Created an issue for that specifically:
https://github.com/NodeBB/NodeBB/issues/3013
closed Ability to disable custom avatar uploads #3013
