This question was submitted to the Google My Business Help Community Forum.
You can only choose one of the verification options available for your listing.
If the only option is a postcard, you need to ask for one.
The verification methods available to each listing will depend on how much trust does Google has on your phone number, website, business existence.
Why does Google do this? To control spam/fake listings creation.
What can you do
Is there any other method to verify your Google My Business listing?
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