I'm getting an error with a notification call in the sandbox. Can't see that anything is wrong. I was able to capture the request and response by setting logging to debug. The request and response are provided below:

REQUEST:
<soap12:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap12="http://www.w3.org/2003/05/soap-envelope">
soap12:Body
<SendNotification3WithHtml xmlns="http://www.q2software.com/Hydra/Q2API">
<CsrLogonName>q2api</CsrLogonName>
<CsrPassword>2q</CsrPassword>
<ABA>022222222</ABA>
<NotificationType>email</NotificationType>
<TargetAddress>[REMOVED]</TargetAddress>
<Subject>Request Credit Card Limit Increase</Subject>
<TargetCountryIsoCodeA3>USA</TargetCountryIsoCodeA3>
<HtmlBody><pre>\nAccount: ************2348\nRequested Date: 10/03/2023 12:00:37\nRequested Credit Limit: $0\nCustomer Profile Name: Mickey Mouse\nRequestor First and Last Name: test FN test LN\nClient Profile Phone Number: None\nRequestor Phone Number: (123) 123-1233\nCurrent Employer: test UMB\nMonthly Housing Payment: $5,000\nHousehold Gross Annual Income: $100,000\nHousehold Other Annual Income: $90,000\nSource of Other Income: 70000\nPromotional Code: test promo\nClient Profile Email: None\nVoicemail Acceptable: True\n</pre></HtmlBody>
<AddHtmlHeaderAndFooter>1</AddHtmlHeaderAndFooter>
<AddDisclaimer>1</AddDisclaimer>
<UiShortName>q2</UiShortName>
<NotificationFlavor>OnlineActivityAlert</NotificationFlavor>
</SendNotification3WithHtml>
</soap12:Body>
</soap12:Envelope>

RESPONSE:
<soap:Envelope xmlns:soap="http://www.w3.org/2003/05/soap-envelope" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
soap:Body
<SendNotification3WithHtmlResponse xmlns="http://www.q2software.com/Hydra/Q2API">
<SendNotification3WithHtmlResult><Q2API HqVersion="4.5.0.6105" HqAssemblyVersion="4.5.0.0" ServerDateTime="2023-10-03T17:00:38.5263991+00:00" AuditId="2854068"><Result><ErrorCode ErrorType="Fail">-1</ErrorCode><ErrorDescription>HydraError:-1/DefaultError</ErrorDescription><HydraErrorReturnCode>-1</HydraErrorReturnCode><HydraErrorReturnCodeDescription>DefaultError</HydraErrorReturnCodeDescription></Result></Q2API></SendNotification3WithHtmlResult>
</SendNotification3WithHtmlResponse>
</soap:Body>
</soap:Envelope>