[Admin]: Donation certificates can't be created anymore

[ssandino]

Is there an existing issue for this?

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Describe the bug

The admin tool includes an option to create donation certificates from the contributors view, but the PDF generation function is currently not working.

Steps To Reproduce

Create certificate for any user and see if the pdf is saved in the storage (and in the users subcollection)

Expected Behavior

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Screenshots?

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Additional context

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