How can add a 3rd Party to my project Scrum Board at Project level and no access else where can this be done?
That will depend on the setup of the permission schemes used on all the projects you have. You must ensure that all those are restricted before granting access to the third party members.
The guidelines would be,
The right solution would need to have deeper knowledge of your environment, if you can't make it alone contact us at our website and we can certainly help with this.
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