It is the responsibility of employers as the local administrators of the NHS Pensions Scheme to inform NHS Pensions of any contact detail changes within your organisation.
Where details change, the appropriate form needs to be completed and returned to NHS Pensions.
The change of contact details form can be found here - https://www.nhsbsa.nhs.uk/employer-hub/employer-forms.
It is imperative that organisations also update their Pensions Online and Make Contribution Payment admin users when any changes happen.