Is there a way to connect to a secured ArcGIS server map services without setting the web connections ArcGIS Portal(template)?

You can use this transformer - https://hub.safe.com/publishers/abley-limited/transformers/arcgis_s_token

To get a token, then pass it through to the feature reader and set the authentication type to token

Thank you so much for the answer. I download the transformer and was able to add the parameters, but I still can't add the feature service reader because I don't know what to type in Token box. Also, what would be the input for ArcGIS_S_Token transformer? Sorry for all my questions, I am fairly new to FME and trying to navigate my way! Thank you!

Ah, so what you're trying to add there is a Reader. A feature reader (as you mentioned in you original post) is similar, but different. A feature reader is a transformer that performs the read and allows you to pass attributes into it - eg the token

To start the process you'd use a creator - this makes a blank/empty feature that can trigger processes

Your workbench would start off like

and the token is specified like

Oh ok! That makes sense now! I apologize I am new to FME and don't always start building my workbenches appropriately. Thank you so much for your time! I'll try that