Two Administrators Required for Attorney Probate Application

I am assisting an executor who wishes to appoint the deceased’s daughter as his attorney for probate purposes.

He is the sole executor but two trustees have been appointed separately in the Will (as there is a life interest). They are also replacement executors.

As you cannot apply as an attorney online, we have submitted a paper application. It has been stopped as the Registry want two administrators for a Will that includes a life interest.

My argument is that two trustees have been appointed in the will already plus the executor is not renouncing, he is just appointing an attorney to act on his behalf and the grant would be limited to reflect this.

Has anyone else experienced this?