Recipient is not Receiving Flow Email - 'Spam Abuse Detected'?

Hello all,

My colleague and I have a PowerApps that sends an email to a recipient upon submitting the data entry form.

Two problems:

1) This was working fine up until the recently where the recipient started receiving this email instead:

Delivery has failed to these recipients or groups:

<RecipientEmail.com>
Your message wasn't delivered because the recipient's email provider rejected it.

Diagnostic information for administrators:

Generating server: LO2P265MB1183.GBRP265.PROD.OUTLOOK.COM

<RecipientEmail.com>
Remote Server returned '550 5.7.501 Service unavailable. Spam abuse detected from IP range. For more information please go to http://go.microsoft.com/fwlink/?LinkId=526653. S(2017052602) [LO4P265MB3519.GBRP265.PROD.OUTLOOK.COM]'

Original message headers:

Received: from LO2P265MB1183.GBRP265.PROD.OUTLOOK.COM ([fe80::8daa:dc46:ef8f:fea8]) by LO2P265MB1183.GBRP265.PROD.OUTLOOK.COM ([fe80::8daa:dc46:ef8f:fea8%6]) with mapi id 15.20.4566.022; Mon, 4 Oct 2021 12:22:42 +0000MIME-Version: 1.0Content-Type: text/plainDate: Mon, 4 Oct 2021 12:22:42 +0000Message-ID: <LO2P265MB1183B1E41212A5E39244E533CEAE9@LO2P265MB1183.GBRP265.PROD.OUTLOOK.COM>Subject: Data Entry Form Failed Checks

2) We have two tenancies that we use as development environments. One for Development, one for Test.

On Dev the recipient receives the failed email above upon submission.

On Test the recipient receives nothing at all upon submission.

Thank you

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