While this is great, it actually includes calculating the end date of the month, which the OP does not need. They need the first day of the month and the current date. So, the following code will do the trick (can be copied and pasted directly to PAD to create all the actions):
DateTime.GetCurrentDateTime.Local DateTimeFormat: DateTime.DateTimeFormat.DateAndTime CurrentDateTime=> CurrentDateTime
DateTime.Add DateTime: CurrentDateTime TimeToAdd: -CurrentDateTime.Day + 1 TimeUnit: DateTime.TimeUnit.Days ResultedDate=> FirstDateTimeOfMonth
Text.ConvertDateTimeToText.FromCustomDateTime DateTime: CurrentDateTime CustomFormat: $'''dd.MM.yyyy''' Result=> FormattedCurrentDate
Text.ConvertDateTimeToText.FromCustomDateTime DateTime: FirstDateTimeOfMonth CustomFormat: $'''dd.MM.yyyy''' Result=> FormattedFirstDateOfMonth
-------------------------------------------------------------------------
If I have answered your question, please mark it as the preferred solution. If you like my response, please give it a Thumbs Up.
I also provide paid consultancy and development services using Power Automate. If you're interested, DM me and we can discuss it.