sfdx force:source:pull ERROR running force:source:pull: Must pass a username and/or OAuth options when creating an AuthInfo instance.

before created and opened a new scratch org

  • It helped me: sfdx force:source:pull -u <scratch org username/alias> – Dmitry Prozorovskiy Dec 24 '19 at 11:19

The issue is when you create the scratch org you will need to set the default scratch org.

You can set a default username using if you have not set during scratch org creation using below

sfdx force:config:set --defaultusername=<username>

Once you set , you don't need to explicitly indicate in push or pull commands.

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