Matomo is Unable to Read from Slave Database

Hi Matomo Team,

I am Abhishek Sharma, the Backend Developer at DotPe. We are using Matomo for e-commerce Analytics. We set up the whole thing and we are trying to read data from its replica as we have 50K domains and high traffic expectancy. But unfortunately, we are not able to do so, as no matter what it is reading from master DB which affects our system performance. We also tried all the steps mentioned here: https://matomo.org/faq/how-to-install/faq_35746/ . But nothing works for us as of now. I am attaching my config.ini.php for your reference. Hoping for an early reply from your side.

; <?php exit; ?> DO NOT REMOVE THIS LINE
; file automatically generated or modified by Matomo; you can manually override the default values in global.ini.php by redefining them in this file.
[database]
host = "xx.x.xx.xx"
username = "matomo_prod"
password = "xxxxxxxxxxx"
dbname = "dotMatomoDB"
tables_prefix = "matomo_"
charset = "utf8mb4"
[database_reader]
host = "xx.x.xx.xxx"
username = "matomo_read"
password = "xxxxxxxxxxx"
dbname = "dotMatomoDB"
port = 3306
aurora_readonly_read_committed = 0
[General]
proxy_client_headers[] = "HTTP_X_FORWARDED_FOR"
salt = "390594d52b0d021e60a74ab1e121fd00"
trusted_hosts[] = "matomo.dotshowroom.in"
[PluginsInstalled]
PluginsInstalled[] = "Diagnostics"
PluginsInstalled[] = "Login"
PluginsInstalled[] = "CoreAdminHome"
PluginsInstalled[] = "UsersManager"
PluginsInstalled[] = "SitesManager"
PluginsInstalled[] = "Installation"
PluginsInstalled[] = "Monolog"
PluginsInstalled[] = "Intl"
PluginsInstalled[] = "CoreVue"
PluginsInstalled[] = "CorePluginsAdmin"
PluginsInstalled[] = "CoreHome"
PluginsInstalled[] = "WebsiteMeasurable"
PluginsInstalled[] = "IntranetMeasurable"
PluginsInstalled[] = "CoreVisualizations"
PluginsInstalled[] = "Proxy"
PluginsInstalled[] = "API"
PluginsInstalled[] = "Widgetize"
PluginsInstalled[] = "Transitions"
PluginsInstalled[] = "LanguagesManager"
PluginsInstalled[] = "Actions"
PluginsInstalled[] = "Dashboard"
PluginsInstalled[] = "MultiSites"
PluginsInstalled[] = "Referrers"
PluginsInstalled[] = "UserLanguage"
PluginsInstalled[] = "DevicesDetection"
PluginsInstalled[] = "Goals"
PluginsInstalled[] = "Ecommerce"
PluginsInstalled[] = "SEO"
PluginsInstalled[] = "Events"
PluginsInstalled[] = "UserCountry"
PluginsInstalled[] = "GeoIp2"
PluginsInstalled[] = "VisitsSummary"
PluginsInstalled[] = "VisitFrequency"
PluginsInstalled[] = "VisitTime"
PluginsInstalled[] = "VisitorInterest"
PluginsInstalled[] = "RssWidget"
PluginsInstalled[] = "Feedback"
PluginsInstalled[] = "TwoFactorAuth"
PluginsInstalled[] = "CoreUpdater"
PluginsInstalled[] = "CoreConsole"
PluginsInstalled[] = "ScheduledReports"
PluginsInstalled[] = "UserCountryMap"
PluginsInstalled[] = "Live"
PluginsInstalled[] = "PrivacyManager"
PluginsInstalled[] = "ImageGraph"
PluginsInstalled[] = "Annotations"
PluginsInstalled[] = "MobileMessaging"
PluginsInstalled[] = "Overlay"
PluginsInstalled[] = "SegmentEditor"
PluginsInstalled[] = "Insights"
PluginsInstalled[] = "Morpheus"
PluginsInstalled[] = "Contents"
PluginsInstalled[] = "BulkTracking"
PluginsInstalled[] = "Resolution"
PluginsInstalled[] = "DevicePlugins"
PluginsInstalled[] = "Heartbeat"
PluginsInstalled[] = "Marketplace"
PluginsInstalled[] = "ProfessionalServices"
PluginsInstalled[] = "UserId"
PluginsInstalled[] = "CustomJsTracker"
PluginsInstalled[] = "Tour"
PluginsInstalled[] = "PagePerformance"
PluginsInstalled[] = "CustomDimensions"

Thanks and Regards
Abhishek Sharma