Opsgenie Check_Mk integration not working

[akhilthomas03]

I followed the below document to integrate Opsgenie with checkMk. https://support.atlassian.com/opsgenie/docs/integrate-opsgenie-with-checkmk/
I downloaded the plugin and put the plugin under /omd/sites/[site name]/local/share/check_mk/notifications/
Changed the first line to #!/usr/bin/env python as per #24
The relevant logs from /var/log/notify.log

2022-05-26 08:36:36 Got raw notification (xxxxxxxxxxxx) context with 71 variables
2022-05-26 08:36:36 Global rule 'Opsgenie'...
2022-05-26 08:36:36  -> matches!
2022-05-26 08:36:36    - adding notification of <xxxxxxx> via opsgenie

2022-05-26 08:36:36   * notifying <xxxxxxx>  via opsgenie, parameters: https://api.eu.opsgenie.com/v1/json/checkmk?apiKey=<xxxxxxxxxxxxxx>, bulk: no
2022-05-26 08:36:36 Creating spoolfile: /omd/sites/xxxxxx/var/check_mk/notify/spool/6aa3bdef-xxxxxxxxxxxxxxxxxx

2022-05-26 08:36:40 Got spool file 6aa3bdef (xxxxxxxxxxxxxxxxxxx) for local delivery via opsgenie
2022-05-26 08:36:40      executing /omd/sites/xxxxx/local/share/check_mk/notifications/opsgenie

Can someone help me to identify the issue?