Hi @Harry N Nomikos ,
By default, calculated column does not support choice field with checkboxes (allow multiple selections). So it is not possible to achieve your needs through formulas.
Supported Columns in SharePoint Calculated Column Formula:
- Title.
- Created.
- Modified.
- A single line of text.
- Choice (menu to choose from) | Single Selection.
- Number (1, 1.0, 100).
- Currency ($, ¥, €).
- Date and Time.
- Yes/No (checkbox).
- Calculated (calculation based on other columns).
- Task Outcome.
- External Data.
- Content-Type Columns.
If you don't want to follow the steps in the link you provided and don't have access to Power Apps. As a workaround, you could create a flow as following pictures show.
If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.