Be CAREFUL here: the filename is "authorized_keys2" for the SSH version2 file, the docs didn't say that, I actually told netapp about that Doc bug. Authorized_keys is for version 1, which you shouldn't be using anymore. Netapp's SSH client is based on OpenSSH so you can follow any docs on that to see how it really works.
Then that would be a difference from the standard OpenSSH releases. OpenSSH does not require the use of "authorized_keys2" (or hasn't for years). Both v1 and v2 keys happily live together in the default location of ".ssh/authorized_keys".
I haven't used this feature in OnTAP, so I don't know if it is required for setup there.