The fiscal sponsor must be a 501(c)(3) organization as recognized by the IRS. The fiscal sponsor cannot be an organization whose tax-exempt status is pending. The sponsored project must be able to qualify for exemption under section 501(c)(3), even if the project has no intention of ever applying for it.
Pressing the Ignore button on the listed invitation on the LinkedIn site is effectively a soft rejection. The message then moves to your Archived folder. You can later choose to open the message again and accept the request.
How to troubleshoot an Error 5 or Access Denied when a service on your computer fails to start. This can occur if the permissions on the service account that is used to start the service have been changed or does not have permissions to the Windows registry keys used by the service.