Microsoft project management software used to plan, manage, and communicate a project schedule and other information among workgroup members, project managers, and other stakeholders.
Dear James,
Thanks for your updates and kindness.
I can reproduce the issue in our environment.
When using the resource sheet to append the resource to the active project, the resources aren't added to the existing projects and just add the resources to the Resource sheet and Resource usage.
The only workaround currently is to import the Task sheet, the Resource sheet and the Assignment sheet to a new project in one time and all data should be imported to Project correctly.
As it is a feature issue and needs to be changed by the product developers and our product developers are willing to listen to users' requirements, I suggest you send your feedback and pass on your suggestions and report the issue to our new feedback platform mentioned in the following article so that product developers know your suggestions and feedback to improve the product.
Submit feedback for Microsoft 365 - Microsoft Community Center
Please note that the platform page will load after a while depending on the network environments.
You can also access the page as follows to submit feedback.
You can use a personal account or a Microsoft 365 work or school account to send feedback.
Moreover, if you are the administrator in your tenant, you can also follow the steps in Get support - Microsoft 365 admin | Microsoft Learn to open a support ticket to report the issue to our related team as soon as possible.
About admin roles in the Microsoft 365 admin center - Microsoft 365 admin | Microsoft Learn
How do I find my Microsoft 365 admin? - Microsoft Support
The administrator should be able to open the support ticket from Help & support in the Microsoft 365 admin center.
Then you can select the Phone support or the Email support as follows.
To simplify the process, I'd like to summarize the issue as follows.
Issue Symptom:
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When using the Append to the active project option to import the resource sheet from Excel to Project, the resources aren't appended to the Gantt sheet of the existing project tasks.
Issue Environment:
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Project Desktop Client
Can we reproduce the issue?
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Yes
Next Step:
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Open a support ticket to our related team for further investigation.
Sorry for that we may have limited resources on contacting the related team from our side.
Thanks for your effort and hope that the issue can be soon confirmed and fixed by our related team.
Sincerely
Cliff | Microsoft Community Moderator