Assisted GPS on MC7355 : can't

I am trying to setup assisted GPS on a MC7355. The device has LTE connection working, and shown in:
AT$QCMIPGETP
Profile:1 Enabled
(…)

However, I can’t get GPSSUPL or GPSXTRA to work so I am stuck on manual GPSPOSMODE

AT!GPSPOSMODE?
MASK: 0x00000001

I believe this is because it can’t use the default connection, because commands like GPSSUPLPID are not implemented:

AT!GPSSUPLURL=“supl.google.com
OK
AT!GPSPORTID=7278
OK

AT!GPSSUPLPID=?
!GPSSUPLPID: NOT IMPLEMENTED

I have tried to use XTRA instead, but it doesn’t work either:

at!GPSXTRASTATUS?
Xtra Time status = Valid
Xtra Data status = Invalid
Validity Start = 1980 01 06 6 00:00:00
Validity End = 1980 01 06 6 00:00:00

AT!GPSXTRADATAENABLE?

XTRA Data Enabled: 2
XTRA Data Retry Number: 3
XTRA Data Retry Interval: 10
XTRA Data Autodownload Enabled: 0
XTRA Data Autodownload Interval: 48
XTRA Data Validity Time: 48

It can’t acquire it, but says ok
AT!GPSXTRAINITDNLD
OK

So I tried to manually add the APN , but that didn’t work either.

I tried changing my syntax in case it was the cause of the problem, or using a different setting in case the GPSXTRAAPN was not supported
AT!GPSXTRAAPN=1,0x10,IPV4,‘r.r5.ispsn’
at!GPSLBSAPN=1,0x10,IPV4,“r.r5.ispsn”
AT!GPSXTRAAPN=1,10,IPV4,‘r.r5.ispsn’
at!GPSLBSAPN=1,10,IPV4,“r.r5.ispsn”

Nope

Any idea of what I should do to get either (or both) SUPL and XTRA to work??