Unable to subscribe to ICS links from ADE

Hi!

The university I am studying at is using ADE Web Direct Planning to manage our time schedules and I want to import mine into the calendar app of the Nextcloud instance I use. ADE seems to provide ICS links (which are insanely long but they really lead to ICS files), however I tried on several Nextcloud instances and I can’t use them on the calendar app of any of them (“Error requesting resource on remote server. This could possible be related to a certificate mismatch”, web console shows a GET (422) error). Also, the SSL certificate of my university looks valid.

On my Android app (Etar), I was able to subscribe to this link, so I don’t think the problem comes from ADE.

I don’t know if it is relevant but here is the link I am trying to use :

ADE link

https://planning.univ-lorraine.fr/jsp/custom/modules/plannings/anonymous_cal.jsp?resources=50418,60448,60449,60450,60451,50424,50451,61288,61289,61290,61291,48786,48787,48788,60527,60528,60555,60556,48790,48791,48792,60531,60532,60559,60560,48794,48795,48796,60521,60522,60549,60550,48798,48799,48800,60529,60530,60557,60558,48802,49238,49239,60525,60526,60553,60554,49242,49243,49246,60523,60524,60551,60552,49299,49314,49323,60543,60544,60571,60572,50388,50397,60541,60542,60569,60570,50400,50401,50402,60535,60536,60563,60564,50404,50405,50406,60539,60540,60567,60568,50408,50409,60537,60538,60565,60566,50411,50412,60533,60534,60561,60562,50415,50416,50417,60545,60546,60573,60574,50420,50421,60547,60548,60575,60576,50439,50440,61314,61315,61349,61350,50443,61324,61325,61326,61359,61360,171702,171703,171919,171938,60317,60318,61302,61303,61337,61338,61362,60320,60321,60322,61298,61299,61333,61334,60323,60324,60325,61296,61297,61331,61332,60326,60327,60328,61294,61295,61329,61330,60329,60330,60331,61300,61301,61335,61336,60332,60333,60334,61304,61305,61339,61340,60335,60336,60337,61312,61313,61347,61348,60338,60339,60340,61310,61311,61345,61346,60341,60342,60343,61308,61309,61343,61344,60344,60345,60346,61306,61307,61341,61342,60347,60348,60349,61316,61317,61351,61352,60350,60351,60352,61318,61319,61353,61354,60353,60354,60355,61320,61321,61355,61356,60356,60357,60358,61322,61323,61357,61358&projectId=6&calType=ical&nbWeeks=16 (I warned you…)

Do you have any hint on how I could get this to work?