Guidelines for group or team work can help students especially when working online.
Guidelines can be created by institutional level or students can create e.g. a team agreement in the beginning of a study unit.
If the institution has made such guidelines educator should make students aware of those in the beginning of the online study unit.
Example of online group-work guidelines: https://www.plymouth.ac.uk/uploads/production/document/path/2/2436/Online_Group_Work_Guidelines.pdf