A recent update from Google Ads now requires your business to add their GST number to your ad campaign.
Google requires all Canadian ad accounts to input their business GST number, starting July 1st.
It is vital that the GST number be inputted before July 1st, so that your ads account doesn't have any complications with Google and stays in good standing.
If you are a Monthly Marketing client, we can help input the number for you as it can be restricted to specific accounts permissions inside Google Ads.
Here’s more details from Google: https://support.google.com/google-ads/answer/2375370?hl=en