Unable to login with Microsoft

We have had the Nextend Social Login PRO plugin for a while on our site, but it was just setup and tested 1 year ago amd worked fine. Now, that we are going into production a problem has occured. We are logging in ok against Facebook and Google, but Microsoft however does not work properly.

I seem to be able to login, there are no problems logged on in the MS App on Entra ID. The secret is valid. I also seem to be logged in in their log, but after logging in on our site with e-mail and MS Authenticator, there seems to be a sort of redirect and the login window shows the URL: https://skolebrygga.no/wp-json/nextend-social-login/v1/microsoft/redirect_uri?code=1.AXQAAdJZgfA86kakxpc94xVa9Y7zlLPjB0NHhnGsrboXLYfiAAB0AA.AgABBAIAAADW6jl31mB3T7ugrWTT8pFeAwDs_wUA9P8eT5Z7GCGIsrrjbEVefpFdTBJAQ0n_P0cHKkBxgx-5qxEi7VKqkvVO1bbGGbQOXI9ZmpsltJ4LwLSo65F5xA-QcVhiOL625QKNoRnGZNo0y6vWJ8aiQWEAZLgn1HCBclD3SemSym9Fdu60koPpvUce1p1M6-MTTCJ2AG1RYYdcJRe6Svoo7xSoCKvoEv362gDKylb-bYqGGARDYkESL2l530hp9fESmdaceA17Y9iJp7EmDqk30PhXd6ngY37AqdFhtrMVWx9gdmxvcagzsbZaT2TboTUX-VNVnYb-vkBKi3vLJEaJ9lr8oV9lTA19WPNODV4MTLGeZWaDXUWbh1-t6ePwKsN4fWNxKb1CIRydyhUI_yfDfByryNA_sLq8ovA-qoGFzzweLgU5EjVZUuIBaGX00i-qRBZ7R5FZk1-rXlJdaBY_UUQrygG0xHflGtQOxKYPvFsC4LBuuAXypjV38DFyCiERRDPKYnysiyJQxAAGiToW5fGYwp6gplncOtG50jLb8nfZFiGbWqg5PnH09OH0Mc1eqYIJpnWUoUPYrl8gbgsWbMOkWQ_CbwihoP-hNT_7IdJDWH5lxgQST_UjtWq_uKKasXsEQYWMBVYp-1scQ2M5Ht78eTKy9oEnnxXxvIfBn2bTC6NsC9GbXUjY0SFsM1qDGgkxQjhb0w8uDgsiGdFKo46RlBtIfY–8r3S6JAQtwBz8VaOnQF90xiUNugMCp5Fp_IMMHucHg47vsDX0V1kLXdQ_T2YO4e_dKZVBguKwHAqqYZUm-qi2Rfd8WbIvNxl18TwPvGe4htidn1tA5pgPw&state=454c9731e3dc7ec61b357e9d7034753f&session_state=7086633c-23c3-4113-b8bf-39b1be1f35c5#

and then an error message:

{“code”:”rest_not_logged_in”,”message”:”Du er ikke innlogget.”,”data”:{“status”:401}}

I have wrecked my brain and searched for solutions for many hours, but no luck.

What could be the problem?