Calendar won't Subscribe from Web

Question

Hello, we are attempting to "Subscribe from web" to a calendar which fails on the web and Outlook app but works on other calendars (Apple, Google). What settings in the MS365 Admin Center control permissions for external calendar feeds? We have tried on different PC's and browsers - as per M365 help suggestion.

This is the error that we get from Outlook via Chrome (see bottom of screenshot):

[

](https://filestore.community.support.microsoft.com/api/images/1327967c-2b4e-47b7-9720-cb38466501d7?upload=true&fud_access=rhYinQu9k%2fQ7lDpdCsGkl3eusmFMeQelfHau4vFjY8lur4WJxfiEK7M3p4%2bs9FkBPy4gjPk1BpzKedTB0Zjh%2bzCRtDd6jCa%2fyokBDwISGOaLz2NNyurtbpNCCvuSAxDElHG%2fn6DLSEvx6me%2bhAe45J5eN641EpPwj7wgNqGL2XYGRaMm5I1J%2fAqsMB7nIju3mlNTJU3PClD%2fvRCOLtrrod5aY87awX1bXWQyfUDZo%2ffLDHe2tmJL6qCECh6WyhxixoHURoTikmLYRNJBDC0HFiaqVHmGVs4L8X29oFWF2M0hu5WeO%2bk2urthwSrngsjJ%2boDoJzFC3XBxCyxrZKoZRbRkq4KfTc6qeRts9Fo3Kys%3d"filestore.community.support.microsoft.com")

and this is what happens in the Outlook app

[

](https://filestore.community.support.microsoft.com/api/images/367d2e0c-6752-48f8-96a7-6d8d1374d436?upload=true&fud_access=rhYinQu9k%2fQ7lDpdCsGkl3eusmFMeQelfHau4vFjY8lur4WJxfiEK7M3p4%2bs9FkBPy4gjPk1BpzKedTB0Zjh%2bzCRtDd6jCa%2fyokBDwISGOaLz2NNyurtbpNCCvuSAxDElHG%2fn6DLSEvx6me%2bhAe45ByFqq9RvlBVyp9REPiT%2fX0GPCxPE1jHeZNvtQ0%2bqXZP2UcTjggUrjr8gpe%2fYUTeNGR3jOzYUtXJXnTbysKT1CWUuTDDxrsrDxyp79oaRf6S0C4hlHpxPNQqObvdZrA5Kl3vHQUt7TtQqTBK8Eonu8RC7DB4jX5gpwCLCGjkmRj1Ht5qFf0AuiByKkjgcf2bR8pAHGWNdj5hWJ4ceaUAvlI%3d"filestore.community.support.microsoft.com")

Same URL works in Apple and Google calendars.

Screenshot of Exchange Admin Center (perhaps we need to add the URL here?):

[

](https://filestore.community.support.microsoft.com/api/images/c801fafd-88fe-4d7d-817a-2f5342390c5f?upload=true&fud_access=rhYinQu9k%2fQ7lDpdCsGkl3eusmFMeQelfHau4vFjY8lur4WJxfiEK7M3p4%2bs9FkBPy4gjPk1BpzKedTB0Zjh%2bzCRtDd6jCa%2fyokBDwISGOaLz2NNyurtbpNCCvuSAxDElHG%2fn6DLSEvx6me%2bhAe45PFcxUo3dBEtb4OpfWdkFv1EtKxFQzcDSNVSfYIvkBNAt0fUCc8CZXpTsz1TN7tg1Y%2bfbcnV863TocyuVkpUnGoY9dHTYEdsw9wvj8PLO8ChgAGTWcLpXrAjaQ5GuVSn%2foEUNXuBSSdslUI4FA1MG2xCfyviwDh5zhkCJVGAnKamn6M98IRu3gIkcnfQLV6MdoXJuVSpEFEvySnnQEjRnQo%3d"filestore.community.support.microsoft.com")

Tried to add organisation and individual relationships but no luck

[

](https://filestore.community.support.microsoft.com/api/images/df2636aa-725e-4c7f-a1cd-e092c8c4412b?upload=true&fud_access=wJJIheezUklbAN2ppeDns8cDNpYs3nCYjgitr%2BfFBh2dqlqMuW7np3F6Utp%2FKMltnRRYFtVjOMO5tpbpW9UyRAwvLeec5emAPixgq9ta07Dgnp2aq5eJbnfd%2FU3qhn54zv1rKXxaJCxHHRr0DQ9x9mWvfJDTQJuHIfxjXrgDfa4osaRlWjMKlSizPwc5JKpw5oWdxqqVnPZYOlayHyUOqqaymlwYbBV1ohXuQO%2F2ewQAt3eJDn0xNBZT0jzvtSnRHuah6K6Cc5QNbJ1QcJcjpw3RH%2B%2BbCTSJdmUUwcTUwnjoy3bqO5IQ1Dj5T33EhHIaOYnJERKiAjGj1dgc3zWvklezn5ZePwGBLLtuI9a9J0F%2Bv5Y%2FXDHNyOtPgabDR4ZIaRMDHIIHnT5H%2Fg1mLD7WBzrmy9DY3JWB20dsDSdXPqk%3D"filestore.community.support.microsoft.com")

[

](https://filestore.community.support.microsoft.com/api/images/cc8e4106-6a38-465d-8099-657162bca63d?upload=true&fud_access=wJJIheezUklbAN2ppeDns8cDNpYs3nCYjgitr%2BfFBh2dqlqMuW7np3F6Utp%2FKMltnRRYFtVjOMO5tpbpW9UyRAwvLeec5emAPixgq9ta07Dgnp2aq5eJbnfd%2FU3qhn54zv1rKXxaJCxHHRr0DQ9x9mWvfJDTQJuHIfxjXrgDfa4osaRlWjMKlSizPwc5JKpw5oWdxqqVnPZYOlayHyUOqqaymlwYbBV1ohXuQO%2F2ewRbbc0WTVMv%2Bv0eBW4V8bPItZjSnYJ7pTGAbVOvdkuz1xpNqmgVF9pI9lBvgYj05qlAyHzXndoprCMhrTbS5OwDcdealpbbiyZ1J49gYSzi9nr7Cu5XGNvhYYrH%2FMutFoUORfhOkNm3WvG6Lap6bzpcET0Gvwlp05eIopWC6cSSucPnxOzngZg8ma%2FqFkMHFmU%3D"filestore.community.support.microsoft.com")