fix: get subscriptions method

[itsmostafa]

fix get subscriptions method in tasks

🗣 Description

💭 Motivation and context

🧪 Testing

✅ Pre-approval checklist

• [x] This PR has an informative and human-readable title.
• [x] I have read the CONTRIBUTING document.
• [x] These code changes follow cisagov code standards.
• [x] All relevant repo and/or project documentation has been updated to reflect the changes in this PR.
• [x] Tests have been added and/or modified to cover the changes in this PR.
• [x] All new and existing tests pass.