Hi @Sabrina B ,
Did you cannot login Visio for Web with the account contain Visio Plan 1 Subscription?
Based on the error message, I suggest you contact the Administrator and check if the Vision web service is turned off:
https://support.microsoft.com/en-us/office/turn-off-or-turn-on-the-visio-web-service-79cd3a5e-acb6-416e-bbe4-162173d33396
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