ngnix issue with chrome redirection non-www to www - linux

Question

I have done basic configuration for my site to run using nginx,
server {
listen 80;
root /home/htdocs/;
index index.html index.htm index.php;
server_name example.com www.example.com;
return 301 https://$server_name$request_uri;
access_log /var/log/nginx/example.com.access.log;
error_log /var/log/nginx/example.com.error.log;
location / {
try_files $uri $uri/ /index.php?$args /;
}
# added error page
error_page 404 = #notfound;
location #notfound {
return 301 /;
}
location ~ \.php$ {
fastcgi_intercept_errors on;
include fastcgi_params;
fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
fastcgi_pass unix:/run/php/php7.4-fpm.sock;
}
location ~ /\.ht {
deny all;
}
}
server {
listen 443 ssl http2;
#listen [::]:443 ssl;
# SSL
ssl_certificate /etc/letsencrypt/live/example.com-0002/fullchain.pem;
ssl_certificate_key /etc/letsencrypt/live/example.com-0002/privkey.pem;
ssl_trusted_certificate /etc/letsencrypt/live/example.com-0002/chain.pem;
ssl_protocols TLSv1.2 TLSv1.3;
root /home/htdocs/;
index index.html index.htm index.php;
server_name www.example.com;
#return 301 https://$server_name$request_uri;
access_log /var/log/nginx/example.com.access.log;
error_log /var/log/nginx/example.com.error.log;
location / {
try_files $uri $uri/ /index.php?$args /;
}
# added error page
error_page 404 = #notfound;
location #notfound {
return 301 /;
}
location ~ \.php$ {
fastcgi_intercept_errors on;
include fastcgi_params;
fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
fastcgi_pass unix:/run/php/php7.4-fpm.sock;
}
location ~ /\.ht {
deny all;
}
}
Whats wrong with above config even I tried in incognito mode of google-chrome but still same.
Hope to hear from you with solution if I'm doing any thing wrong.
Regards
I have tried different solutions and parameters noting work out for me.