unsubscribe link doesn't work anymore

[LeoNun]

Hello, I´m having an issue since I installed magento 2.4, and now still have the problem in magento 2.4.2-p1. The unsubscribe link doesn't work in the newsletter since magento 2.3.5.

The unsubscribe link for both is the same, {{var subscriber.getUnsubscriptionLink()}}

When I check over the unsubscribe link in a newsletter sent with magento 2.4.2 I get a blank page, as it fallows:

Before in magento 2.3.5, a link was generated to unsubscribe, as:

I've found some people with the same issue but nothing in concret to solve the problem.

Is this a bug already reported? Any solution?

Please find more details about the issue below:
#33310 (comment)

Best Regards,
Leonel Nunes

[m2-assistant]

Hi @LeoNun. Thank you for your report.
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[m2-assistant]

Hi @engcom-November. Thank you for working on this issue.
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[LeoNun]

Hello,
I can confirm that the problem of the customer edit page is fixed, so it displays as it showld but the unsubscription doesn't work.

Best regards,
Leonel Nunes

[engcom-November]

Verified the issue on latest Magento version 2.4.2 and the issue is reproducible.
Blank page is displayed in the news Letter. Unsubscribe link is not getting displayed.
Preconditions:
Email configuration is setup on Magento (Ex: SMTP Gmail configuration)
Steps to reproduce:

1. Magento Admin -> Customers -> All Customers -> Edit the Customer -> News Letter -> Subscribe to NewsLetter and save
2. Marketing -> News Letter Template -> Add new template
3. Marketing -> News Letter Template -> Actions -> Queue News Letter - edit and Save News Letter
4. News Letter should be triggered to the Customer email ID. If not triggered, run magento cron job: sudo php bin/magento cron:run, emails would be triggered automatically after running cron.
   Issue: Blank page is displayed in News Letter email. Unsubscribe link is not displayed for any of the below configurations:

[LeoNun]

Hello,
thank for the confirmation, I will wait for an hot fix for this issue.

Best regards,
Leonel Nunes

[SilinMykola]

@magento I am working on this