the first day of the week

In Outlook Monday is set as the first day on my calendar, and this is how the calendar is displayed in Teams. However, when I want to plan a meeting, the little calendar in the pop-up window has Sunday as the first day of the week. It is confusing and I already mis-planned a meeting once. Can I fix this? I checked a similar thread on the forum, but it is from 2020 and maybe MS has come up with some solution since then. The language is set both in my Windows and Teams app to Polish.