Getting "Bad" tag values from an S7-1200 tag

Trying to learn Ignition and figured I would start with the free maker edition. Currently have it connected to an S7-1200 via OPC. The connection is already set. When I go to make a tag and follow along the tutorial guides on here I either name the tag IW0 or Mx10.0 to address it. Both return a value of Bad. Last published value is Null. If I use it in a button I get an Error writing to Input0. Just looking for a direction to go in to get a tag working. Thanks