valid_token_issuers incorrectly populated during SingleTenant validation #2116
Description
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Version
4.15.0
Describe the bug
Tenant specific token issuers (valid_token_issuers) are added as a nested element, instead of individual issuers.
To Reproduce
Steps to reproduce the behavior:
Authenticating with app_type 'SingleTenant' will result in unauthorized requests.
Expected behavior
Tenant specific token issues are treated as valid.