@Greeshma_Sampath1- Although your operator has the named rights, but you should also check if your operator or operator group has the access permissions for that folder (with id 347358852). If you can or ask admin to revise the folder (id 347358852) properties Right-click on the folder and select Pr...

Greeshma_Sampath1- Though your operator has the named rights, but you need to check if your operator or operator group has the access permissions for that folder (with id 347358852).If you can or ask admin to check the folder properties > Security Tab to ensure permissions in place, refer to this do...

Ensure "Refresh for deliverability" workflow is executing fine so the MxRules are up to date and consider sending your delivery in waves.