Firebase Function writing undefined to Firestore

I am new, let me know if anymore information is needed!

I am trying to integrate MessageBird with Firestore. It is writing everything to the database okay except for the "to" field which takes a phone number. I am logging the number and it is being output correctly in the console, except in my Firestore it is being stored as undefined. If anyone can provide any insight as to why this is, that would be greatly appreciated. I have been stuck for some while. (Attached part of function where issue arises and screenshot of console)

I originally tried without using await on the doc.data()?.phoneNum line and just received [object Promise]. Now that it is printing in console I know this has nothing to do with it. Please help!

admin.auth().listUsers().then((res) => {
    res.users.forEach((userRecord) => {
      try {
        const dbRef = firestore()
            .collection("collection").doc(userRecord.uid)
            .collection("collection").doc(document);
        dbRef.get().then((context) => {
          if (context.exists) {
            firestore()
              .collection("collection")
              .doc(userRecord.uid).get()
              .then(async (doc) => {
                number = await doc.data()?.field1;
                console.log("Sending message to: " + number);
              });
            firestore().collection("collection")
              .doc()
              .create({
                channelId: "id",
                type: "text",
                content: {
                  text: "message",
                },
                to: `${number}`,
              });
            functions.logger.log("SUCCESSFULLY SENT TO DB");
          } else {
            // console.log("**Unviable user**");
          }
        });
      } catch (error) {
        console.log(error);
      }
    });
  });

The promises doesn't seem to handled properly. .data() does not return a promise so you don't need an await there. Also I don't see the var 'number' declared anywhere so that'd be undefined. You can try running the following code:

admin.auth().listUsers().then(async (res) => {
    try {
        for (const userRecord in res) {
            const dbRef = firestore()
                .collection("collection").doc(userRecord.uid)
                .collection("collection").doc(document);
            const context = await dbRef.get()
            if (context.exists) {
                const number = (await firestore().collection("collection").doc(userRecord.uid).get()).data().field1
                console.log("Sending message to: " + number);
                await firestore().collection("collection").add({
                    channelId: "id",
                    type: "text",
                    content: {
                        text: "message",
                    },
                    to: `${number}`,
                });
                functions.logger.log("SUCCESS");
            } else {
                // console.log("**Unviable user**");
            }
        }
    } catch (error) {

    }
});

Also forEach doesn't wait for promises to resolve so I've used a for-in loop.